Their fax machine is down, and they haven't received the memo from TPM or ThinkP telling them what they believe?
Slightly less unseriously:
* DU-folk can't/won't see that conquest, subjugation, and convert-or-die is built into the Qur'an;
* DU-folk can't/won't see that the Islamic terrorists see themselves as FAITHFUL and see those not supporting them as insufficiently faithful and expendable;
* DU-folk can't/won't see that competition for power, loot, and sex slaves is built into Islam.
So they willfully don't fully understand pretty much anything the Islamic terrorists do.